470 CRETACEOUS PALEONTOLOGY. 



sinus. Surface of both valves nearly smooth, marked only by 

 fine concentric lines of 'growth which continue across the auricu- 

 lations, and on the anterior ear of the right valve become 

 stronger than elsewhere on the shell. 



Remarks. — One imperfect specimen which seems to be a mem- 

 ber of this species, had a height when complete of about 50 mm., 

 but the dimensions given above are those of a specimen of about 

 average size. Some of the smaller individuals do not exceed 12 

 mm. in height. With the growth of the shell the proportionate 

 width seems to increase. This species is unlike any of the other 

 Pectens in these New Jersey faunas, but in general form and 

 size the shells most closely resemble some individuals of Pecten 

 belliscidptus Con. ; the two species can always be distinguished, 

 however, by their surface markings. 



Formation, and locality. — Cliffwood clay, Clififwood Point 

 (105), near Matawan (107, 189). 



Geographic distribution. — New Jersey. 



Pecten burlingtonensis Gabb. 

 Plate XLIX., Figs. 5-9. 



i860. Pecten burlingtonensis Gabb, Jour. Acad. Nat. Sci. Phil., 



2nd ser., vol. 4, p. 304, pi. 48, fig. 25. 

 1861. Pecten burlingtoiiensis Gabb, Synop. Moll. Cret. Form., 



p. 213 (151). 

 1864. Pecten burlingtonensis Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 7. 

 1868. Syncyclonema burlingtonensis Con., Cook's Geol. N. J., 



P- 725. 

 1870. Campionectes burlingtonensis Con., Am. Jour. Conch., 



vol. 6, p. 76. 

 1876. Camptonectes Burlingtonensis Gabb, Proc. Acad. Nat. 



Sci. Phil. (1876), p. 318. 

 1886. Camptonectes (Amusium) burlingtonensis Wliitf., Pal. 



N. J., vol. I (Monog. U. S. G. S., vol. 9), p. 53, pi. 



8, figs. 7 ? and 8 (not 3-6 and g=P argillensis Con.). 

 1886. Pecten (Syncyclonema ?) perlamellosus Whitf., Pal. N. 



J., vol. I (Monog. U. S. G. S., vol. 9), p. 50^, pi. 7, 



fig. 7. 



